/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type { Releasable } from '@ohos/common';
import { PixelMapWrapper } from './PixelMapWrapper';

export abstract class ImageFilterBase implements Releasable {
  private filterName: string;
  private cache: PixelMapWrapper = undefined;

  constructor(name: string) {
    this.filterName = name;
  }

  abstract render(pixelMap: PixelMapWrapper): PixelMapWrapper;

  setCache(pixelMap: PixelMapWrapper) {
    this.release();
    this.cache = pixelMap;
  }

  getCache(): PixelMapWrapper {
    return this.cache;
  }

  release(): void {
    if (this.isCached()) {
      this.cache.release();
      this.cache = undefined;
    }
  }

  isCached(): boolean {
    return (this.cache != null && this.cache != undefined);
  }

  name(): string {
    return this.filterName;
  }
}